C++ shangji3构造函数和析构函数

小e~

于 2022-10-23 20:48:07 发布

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文章标签： c++

本文链接：https://blog.youkuaiyun.com/Feng0312_/article/details/127479726

版权

该C++程序定义了一个StudentScore类，用于输入学生姓名和各科成绩，显示学生信息，计算平均成绩，展示课程平均分，并能按科目对成绩进行排序。主要功能包括输入学生数据、显示学生详细信息、计算个人和课程平均分以及按科目排序成绩。

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#include <iostream>
#include<string>
using namespace std;
class StudentScore {
public:
   StudentScore()
   {
       student_nr = 2;
   }
   StudentScore(int student_count)
   {
       student_nr = student_count;
   }
   void InputStudentNameAndScore();
   void ShowStudentNameAndSore();
   void ShowStudentAvgScore(int student_id);
   void ShowCourseAvgScore(string course_name);
   void OrderScoreByCourse(string course_name);
private:
   float score_table[100][3];
   string name_attay[100];
   int student_nr;

};

void StudentScore::InputStudentNameAndScore()
{
for (int i = 0; i < student_nr; i++)
{

       cout << "请输入学生姓名：" << endl;
       cin >> name_attay[i];
       cout << "请输入科目A成绩：" << endl;
       cin >> score_table[i][0];
       cout << "请输入科目B成绩：" << endl;
       cin >> score_table[i][1];
       cout << "请输入科目C成绩：" << endl;
       cin >> score_table[i][2];

   }
}
void StudentScore::ShowStudentNameAndSore()
{
   for (int i = 0; i < student_nr; i++) {
       cout << "姓名:" << name_attay[i] << "科目A成绩：" << score_table[i][0] << "科目B成绩:" << score_table[i][1] << "科目C成绩:" << score_table[i][2] << endl;

}

}
void StudentScore::ShowStudentAvgScore(int student_id)
{
   for (int i = 0; i < student_nr; i++) {
       float avg = 0;
       avg = score_table[i][0] + score_table[i][1] + score_table[i][2];
       avg = avg / 3;
       cout << "姓名" << name_attay[i] << "平均成绩：" << avg << endl;
   }

}
void StudentScore::ShowCourseAvgScore(string course_name) {
   float avga = 0;
   float avgb = 0;
   float avgc = 0;
   for (int i = 0; i < student_nr; i++) {
       avga = avga + score_table[i][0];
       avgb = avgb + score_table[i][1];
       avgc = avgc + score_table[i][2];

   }
   avga = avga / student_nr;
   avgb = avgb / student_nr;
   avgc = avgc / student_nr;
   cout << "课程名称:A 平均成绩" << avga << endl;
   cout << "课程名称：B 平均成绩" << avgb << endl;
   cout << "课程名称：C 平均成绩" << avgc << endl;

}
void StudentScore::OrderScoreByCourse(string course_name) {

   for (int j = 0; j < 3; j++) {
       float temp;
       for (int i = 0; i < student_nr; i++)
       {
           if (score_table[i + 1][j] > score_table[i][j])
           {
               temp = score_table[i + 1][j];
               score_table[i + 1][j] = score_table[i][j];
               score_table[i][j] = temp;

}
}

   }
   cout << "课程A成绩排序：";
   for (int i = 0; i < student_nr; i++)

cout << score_table[i][0] << " ";
cout << endl;

   cout << "课程B成绩排序：";
   for (int i = 0; i < student_nr; i++)
       cout << score_table[i][1] << " ";
   cout << endl;

   cout << "课程C成绩排序：";
   for (int i = 0; i < student_nr; i++)
       cout << score_table[i][2] << " ";
   cout << endl;

}
int main()
{
   StudentScore x;
   x.InputStudentNameAndScore();
   x.ShowStudentNameAndSore();
   x.ShowStudentAvgScore(1);
   x.ShowCourseAvgScore("A");
   x.OrderScoreByCourse("B");
   return 0;

}

运行结果如图：